http://www.cut-the-knot.org/Curriculum/Geometry/ParallelLinesAndSimilarTriangles.shtml"The problem is: in ΔABC draw lines BD and CE with D on AC and E on AB. Let F on AB and G on AC be such that DF||CE and EG||BD. Then FG||AB."The last sentence should be FG||BC
"The problem is: in ΔABC draw lines BD and CE with D on AC and E on AB. Let F on AB and G on AC be such that DF||CE and EG||BD. Then FG||AB."
The last sentence should be FG||BC